/* ========================================
   USB Redirector 中文官网 - 公共样式
   主题色: #4F5355 (深灰) #108BC2 (蓝)
   ======================================== */

/* CSS Reset & Base */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    color: #333;
    background-color: #fff;
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: #108BC2;
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: #0d6fa0;
}

img {
    max-width: 100%;
    height: auto;
}

/* 容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 通用按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    text-decoration: none;
    line-height: 1.4;
}

.btn svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.btn-primary {
    background: linear-gradient(135deg, #108BC2, #0d6fa0);
    color: #fff;
    box-shadow: 0 4px 15px rgba(16, 139, 194, 0.3);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #0d9fe0, #108BC2);
    color: #fff;
    box-shadow: 0 6px 20px rgba(16, 139, 194, 0.4);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: #4F5355;
    border: 2px solid #d0d5d9;
}

.btn-outline:hover {
    border-color: #108BC2;
    color: #108BC2;
    transform: translateY(-2px);
}

/* 区块标题 */
.section-title {
    font-size: 32px;
    font-weight: 700;
    color: #4F5355;
    text-align: center;
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 17px;
    color: #6b7280;
    text-align: center;
    margin-bottom: 48px;
    max-width: 680px;
    margin-left: auto;
    margin-right: auto;
}

/* 分隔线 */
.divider {
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, #108BC2, #0d6fa0);
    border-radius: 2px;
    margin: 16px auto 24px;
}

/* 卡片通用 */
.card {
    background: #fff;
    border-radius: 16px;
    padding: 32px;
    border: 1px solid #e8ecf0;
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
    transform: translateY(-4px);
}

/* 响应式 */
@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }

    .section-title {
        font-size: 26px;
    }

    .section-subtitle {
        font-size: 15px;
        margin-bottom: 32px;
    }

    .btn {
        padding: 10px 22px;
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

    .section-title {
        font-size: 22px;
    }
}